“There is a tremendous pressure and need to fly unmanned aircraft in (civilian) airspace,” Hank Krakowski, FAA’s head of air traffic operations, told European aviation officials recently. “We are having constant conversations and discussions, particularly with the Department of Defense and the Department of Homeland Security, to figure out how we can do this safely with all these different sizes of vehicles.”

There are two types of unmanned planes: Drones, which are automated planes programmed to fly a particular mission, and aircraft that are remotely controlled by someone on the ground, sometimes from thousands of miles away.